Compliance refers to the degree to which a patient's behaviour concurs with instructions from a health care practitioner. Patient compliance to the training regimen will be defined as the percent time spent at the prescribed training intensity during the 12-week program. This measure will be obtained through Technogym (Bike Med 700 CE-R LED; Polar HR monitor and computer; CardioMemory software package) and which allows second-by-second tracking of individual exercise sessions. Compliance to the target intensity will be determined by assessing the percent time spent within the target HR range (±5beats/min) during the training phase of each exercise session and then averaged for the 12-week program.